Type
Zone
Age range
166.4–166.2 Ma

International Timescale

Middle Jurassic
Bathonian

Ammonite Zonation - Boreal

Clydoniceras discus
Oxycerites orbis
Procerites hodsoni
166.40166.39166.38166.37166.36166.35166.34166.33166.32166.31166.30166.29166.28166.27166.26166.25166.24166.23166.22166.21166.20

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